I have been having intermittent connection issues with my Technicolor TC8305C over the past several weeks. Prior to this, the cable modem and connection have been mostly stable and issue-free for around the better part of a year. I haven't modified anything on my end of the network during this time span.
When the connection has gone down, the past several times I've noticed that the US/DS light is slowly flashing, which I believe indicates that it is in one of its training phases. The US/DS light stays flashing, and won't resolve to solid-on. I have found that I can simply detach the coax cable from the wall cable outlet, reattach it, and the modem will complete training, and my internet connection will come back up. So, no power cycling or modem provisioning is required to regain internet connectivity, just unplugging the coax cable and then reconnecting the coax cable. Unfortunately after a few hours the connection will drop out again, and I have to repeat these steps to regain an internet connection.
I was suspicious that the issue might be due to the short coax "jumper" between the Technicolor box and the wall outlet (about 2 or 3 feet long), so I replaced the coax "jumper" with a newer one, and the problem still persists. So I now don't believe that there's an issue with this small piece of coax.
I've contacted Comcast customer service twice regarding the issue, and all they seem to be equipped to do is to remotely reset the modem, which does reestablish my connection, but is only a temporary "fix" since the modem will drop out again after a few hours of operation.
I do have a separate wifi router attached to the Technicolor modem, but have bypassed this separate wifi router with a couple of devices plugged directly into the Technicolor, just to see if the connection issues were being caused by the Technicolor, and they do seem to be (especially since I can see that the cable modem US/DS light indicates the cable modem is having issues with its connection back to the Comcast end of the link). So the wifi router being in the picture doesn't appear to be a factor.
Here's the cable modem info:
| HW Version: | 1.5 |
|---|---|
| Vendor: | Technicolor |
| BOOT Version: | 2.1.8_Technicolor |
| Core Version: | 01.E6.01.22.25 |
| Model: | TC8305C |
| Product Type: | Technicolor DOCSIS 3.0 Packet Cable 2.0 advanced cable gateway |
| Flash Part: | 64 MB |
| Download Version: | 01.E6.01.22.25 |
Any tips or advice is greatly appreciated! Thank you.